Heat Transfer
For shell and tube heat exchanger, with increasing heat transfer area, the purchased cost per unit heat transfer area

Passes through a maxima
Increases
Decreases
Remains constant

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Heat Transfer
Prandtl number is the ratio of

Thermal diffusivity to momentum diffusivity
Momentum diffusivity to mass diffusivity
Momentum diffusivity to thermal diffusivity
Thermal diffusivity to mass diffusivity

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